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                                <div id="anchor-navigation-ex-navbar"><i class="fa fa-navicon"></i><ul><li><span class="title-icon "></span><a href="#&#x57FA;&#x7840;&#x6982;&#x5FF5;"><b>1. </b>&#x57FA;&#x7840;&#x6982;&#x5FF5;</a></li><ul><li><span class="title-icon "></span><a href="#&#x6307;&#x793A;&#x51FD;&#x6570;"><b>1.1. </b>&#x6307;&#x793A;&#x51FD;&#x6570;</a></li><ul><li><span class="title-icon "></span><a href="#&#x5B9A;&#x4E49;"><b>1.1.1. </b>&#x5B9A;&#x4E49;</a></li><li><span class="title-icon "></span><a href="#&#x4F8B;&#x5B50;"><b>1.1.2. </b>&#x4F8B;&#x5B50;</a></li></ul></ul></ul></div><a href="#&#x57FA;&#x7840;&#x6982;&#x5FF5;" id="anchorNavigationExGoTop"><i class="fa fa-arrow-up"></i></a><div class="treeview__container"><div class="treeview__container-title"><span class="treeview__main-title">Treeview</span><span class="treeview__copyright">Copyright &#xA9; aleen42 all right reserved, powered by <a href="https://github.com/aleen42" target="_blank">aleen42</a></span></div><ul>
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<li><div><a href="#&#x5B9A;&#x4E49;">&#x5B9A;&#x4E49;</a><i></i></div></li>
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<h1 id="&#x57FA;&#x7840;&#x6982;&#x5FF5;"><a name="&#x57FA;&#x7840;&#x6982;&#x5FF5;" class="anchor-navigation-ex-anchor" href="#&#x57FA;&#x7840;&#x6982;&#x5FF5;"><i class="fa fa-link" aria-hidden="true"></i></a>1. &#x57FA;&#x7840;&#x6982;&#x5FF5;</h1>
<h2 id="&#x6307;&#x793A;&#x51FD;&#x6570;"><a name="&#x6307;&#x793A;&#x51FD;&#x6570;" class="anchor-navigation-ex-anchor" href="#&#x6307;&#x793A;&#x51FD;&#x6570;"><i class="fa fa-link" aria-hidden="true"></i></a>1.1. &#x6307;&#x793A;&#x51FD;&#x6570;</h2>
<h3 id="&#x5B9A;&#x4E49;"><a name="&#x5B9A;&#x4E49;" class="anchor-navigation-ex-anchor" href="#&#x5B9A;&#x4E49;"><i class="fa fa-link" aria-hidden="true"></i></a>1.1.1. &#x5B9A;&#x4E49;</h3>
<p> &#x5728;<a href="https://baike.baidu.com/item/&#x96C6;&#x5408;&#x8BBA;/494533" target="_blank">&#x96C6;&#x5408;&#x8BBA;</a>&#x4E2D;&#xFF0C;<strong>&#x6307;&#x793A;&#x51FD;&#x6570;</strong>&#x662F;&#x5B9A;&#x4E49;&#x5728;&#x67D0;<a href="https://baike.baidu.com/item/&#x96C6;&#x5408;/2908117" target="_blank">&#x96C6;&#x5408;</a><em>X</em>&#x4E0A;&#x7684;<a href="https://baike.baidu.com/item/&#x51FD;&#x6570;/301912" target="_blank">&#x51FD;&#x6570;</a>&#xFF0C;&#x8868;&#x793A;&#x5176;&#x4E2D;&#x6709;&#x54EA;&#x4E9B;&#x5143;&#x7D20;&#x5C5E;&#x4E8E;&#x67D0;&#x4E00;&#x5B50;&#x96C6;<em>A</em>&#x3002; </p>
<h3 id="&#x4F8B;&#x5B50;"><a name="&#x4F8B;&#x5B50;" class="anchor-navigation-ex-anchor" href="#&#x4F8B;&#x5B50;"><i class="fa fa-link" aria-hidden="true"></i></a>1.1.2. &#x4F8B;&#x5B50;</h3>
<p>&#x96C6;&#x5408;X&#x7684;&#x5B50;&#x96C6;<span class="katex"><span class="katex-mathml"><math><semantics><mrow><mi>A</mi></mrow><annotation encoding="application/x-tex">A</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="strut" style="height:0.68333em;"></span><span class="strut bottom" style="height:0.68333em;vertical-align:0em;"></span><span class="base textstyle uncramped"><span class="mord mathit">A</span></span></span></span>  &#x7684;&#x6307;&#x793A;&#x51FD;&#x6570;&#x662F;&#x51FD;&#x6570;<span class="katex"><span class="katex-mathml"><math><semantics><mrow><msub><mn>1</mn><mi>A</mi></msub><mo>:</mo><mi>X</mi><mo>&#x2192;</mo><mo>{</mo><mn>0</mn><mo separator="true">,</mo><mn>1</mn><mo>}</mo></mrow><annotation encoding="application/x-tex">1_A:X\rightarrow \{0,1\}</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="strut" style="height:0.75em;"></span><span class="strut bottom" style="height:1em;vertical-align:-0.25em;"></span><span class="base textstyle uncramped"><span class="mord"><span class="mord mathrm">1</span><span class="msupsub"><span class="vlist"><span style="top:0.15em;margin-right:0.05em;margin-left:0em;"><span class="fontsize-ensurer reset-size5 size5"><span style="font-size:0em;">&#x200B;</span></span><span class="reset-textstyle scriptstyle cramped mtight"><span class="mord mathit mtight">A</span></span></span><span class="baseline-fix"><span class="fontsize-ensurer reset-size5 size5"><span style="font-size:0em;">&#x200B;</span></span>&#x200B;</span></span></span></span><span class="mrel">:</span><span class="mord mathit" style="margin-right:0.07847em;">X</span><span class="mrel">&#x2192;</span><span class="mopen">{</span><span class="mord mathrm">0</span><span class="mpunct">,</span><span class="mord mathrm">1</span><span class="mclose">}</span></span></span></span>,&#x5B9A;&#x4E49;&#x4E3A;</p>
<p><img src="../images/1618992873958.png" alt="1618992873958" style="zoom: 10%;"></p>
<p> <span class="katex"><span class="katex-mathml"><math><semantics><mrow><mi>A</mi></mrow><annotation encoding="application/x-tex">A</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="strut" style="height:0.68333em;"></span><span class="strut bottom" style="height:0.68333em;vertical-align:0em;"></span><span class="base textstyle uncramped"><span class="mord mathit">A</span></span></span></span>&#x7684;&#x6307;&#x793A;&#x51FD;&#x6570;&#x4E5F;&#x8BB0;&#x4F5C; <span class="katex"><span class="katex-mathml"><math><semantics><mrow><msub><mn>1</mn><mi>A</mi></msub><mo>(</mo><mi>x</mi><mo>)</mo></mrow><annotation encoding="application/x-tex">1_A(x)</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="strut" style="height:0.75em;"></span><span class="strut bottom" style="height:1em;vertical-align:-0.25em;"></span><span class="base textstyle uncramped"><span class="mord"><span class="mord mathrm">1</span><span class="msupsub"><span class="vlist"><span style="top:0.15em;margin-right:0.05em;margin-left:0em;"><span class="fontsize-ensurer reset-size5 size5"><span style="font-size:0em;">&#x200B;</span></span><span class="reset-textstyle scriptstyle cramped mtight"><span class="mord mathit mtight">A</span></span></span><span class="baseline-fix"><span class="fontsize-ensurer reset-size5 size5"><span style="font-size:0em;">&#x200B;</span></span>&#x200B;</span></span></span></span><span class="mopen">(</span><span class="mord mathit">x</span><span class="mclose">)</span></span></span></span>&#x6216;<span class="katex"><span class="katex-mathml"><math><semantics><mrow><msub><mi>X</mi><mi>A</mi></msub><mo>(</mo><mi>x</mi><mo>)</mo></mrow><annotation encoding="application/x-tex">X_A(x)</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="strut" style="height:0.75em;"></span><span class="strut bottom" style="height:1em;vertical-align:-0.25em;"></span><span class="base textstyle uncramped"><span class="mord"><span class="mord mathit" style="margin-right:0.07847em;">X</span><span class="msupsub"><span class="vlist"><span style="top:0.15em;margin-right:0.05em;margin-left:-0.07847em;"><span class="fontsize-ensurer reset-size5 size5"><span style="font-size:0em;">&#x200B;</span></span><span class="reset-textstyle scriptstyle cramped mtight"><span class="mord mathit mtight">A</span></span></span><span class="baseline-fix"><span class="fontsize-ensurer reset-size5 size5"><span style="font-size:0em;">&#x200B;</span></span>&#x200B;</span></span></span></span><span class="mopen">(</span><span class="mord mathit">x</span><span class="mclose">)</span></span></span></span></p>
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